{"id":2660,"date":"2022-12-14T15:25:00","date_gmt":"2022-12-14T07:25:00","guid":{"rendered":"https:\/\/www.qhsmt.com\/?p=2660"},"modified":"2022-12-14T15:16:53","modified_gmt":"2022-12-14T07:16:53","slug":"smt-pick-and-place-machine-what-are-the-sampling-methods-for-smt-processing","status":"publish","type":"post","link":"https:\/\/www.qhsmt.com\/zh\/2022\/12\/14\/smt-pick-and-place-machine-what-are-the-sampling-methods-for-smt-processing\/","title":{"rendered":"Do you know what are the sampling methods for SMT processing?"},"content":{"rendered":"

What are the sampling methods for SMT processing ? today author from qihe smt pick and place machine tell you about it with you .<\/p>\n\n\n\n

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In the past, the percentage sampling inspection method was generally adopted.
China has always followed the percentage sampling inspection method adopted by the former Soviet Union in the 1940s.
This inspection method assumes that the sample is always proportional to the whole,
Therefore, maintain a fixed ratio between the number of inspection samples and the overall number of inspection batches, such as 5%, 0.5%, etc.
However, in fact, there is an irrationality of being strict with a large number of batches and lenient with a small batch.<\/p>\n\n\n\n

That is to say, even products of the same quality,
Due to the different number of viewing batches, they are processed differently.
And as the overall number of viewing batches increases,
Even if a certain percentage is sampled, the sample size is quite large,
The advantages of sampling inspection in terms of economy cannot be reflected.
Therefore, this sampling inspection method has been phased out.
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People have studied the percentage sampling inspection method,
Knowing that the fundamental reason for the unreasonable percentage sampling inspection method is that the sampling plan is not designed according to the scientific method of mathematical calculation
Therefore, a series of various computational sampling inspections or computational sampling inspection plans based on probability theory and mathematical computing science have been gradually studied and planned,
And formulate a standardized sampling inspection plan.<\/p>\n\n\n\n

When the sampling inspection method specification is applied to product quality inspection,
Although there is a possibility of misjudgment,
That is to say, there are risks on the production side and risks on the application side,
However, by choosing an appropriate sampling plan,
To keep this danger of misjudgment within the limits required,
In line with the objective and actual needs of social production and application,
Therefore, it has been widely promoted in countries all over the world.
It replaces the original unreasonable percentage sampling inspection method.<\/p>\n\n\n\n

The above is the author from qihe smt pick and place machine wants to sharing with you. If there is some inappropriate content or suggestion .I hope you can leave a reply to tell me and communicate with each other.
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